Apparatus and method determining weighting function for linear prediction coding coefficients quantization
First Claim
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1. A method of quantizing a signal, implemented by at least one processor, the method comprising:
- obtaining a linear predictive coding (LPC) coefficient of a subframe from a current frame of the signal;
obtaining a line spectral frequency (LSF) coefficient of the subframe from the LPC coefficient of the subframe;
normalizing the LSF coefficient based on a number of spectral bins in the subframe;
determining a weighting function of the subframe by combining a first weighting function based on a magnitude of a spectral bin corresponding to the normalized LSF coefficient and a second weighting function based on frequency information for the normalized LSF coefficient andquantizing the LSF coefficient based on the determined weighting function,wherein the signal has one or a combination of a speech signal and a music signal, andwherein the frequency information is determined based on at least one of a bandwidth and a coding mode of the signal.
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Abstract
An apparatus determining a weighting function for line prediction coding coefficients quantization converts a linear prediction coding (LPC) coefficient of an input signal into one of a line spectral frequency (LSF) coefficient and an immitance spectral frequency (ISF) coefficient and determines a weighting function associated with one of an importance of the ISF coefficient and importance of the LSF coefficient using one of the converted ISF coefficient and the converted LSF coefficient.
18 Citations
14 Claims
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1. A method of quantizing a signal, implemented by at least one processor, the method comprising:
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obtaining a linear predictive coding (LPC) coefficient of a subframe from a current frame of the signal; obtaining a line spectral frequency (LSF) coefficient of the subframe from the LPC coefficient of the subframe; normalizing the LSF coefficient based on a number of spectral bins in the subframe; determining a weighting function of the subframe by combining a first weighting function based on a magnitude of a spectral bin corresponding to the normalized LSF coefficient and a second weighting function based on frequency information for the normalized LSF coefficient and quantizing the LSF coefficient based on the determined weighting function, wherein the signal has one or a combination of a speech signal and a music signal, and wherein the frequency information is determined based on at least one of a bandwidth and a coding mode of the signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for quantizing a signal, the apparatus comprising:
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at least one processing device configured to; obtain a linear predictive coding (LPC) coefficient of a subframe from a current frame of the signal; obtain a line spectral frequency (LSF) coefficient of the subframe from the LPC coefficient of the subframe; normalize the LSF coefficient based on a number of spectral bins in the subframe; determine a weighting function of the subframe by combining a first weighting function based on a magnitude of a spectral bin corresponding to the normalized LSF coefficient and a second weighting function based on frequency information for the normalized LSF coefficient; and quantize the LSF coefficient based on the determined weighting function, wherein the signal has one or a combination of a speech signal and a music signal, and wherein the frequency information is determined based on at least one of a bandwidth and a coding mode of the signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification